Robert van den Bosch (31 March 1922 – 19 November 1978) was an American entomologist and proponent for the management of insect pests without the use of insecticides and especially through biological control. He was the author of the influential textbook on Biological Control first published in 1973 and a more influential popular book The Pesticide Conspiracy (1978) that aimed to inform the public of the threats of pesticides and how industrial forces influenced science and agriculture. He was among the few entomologists who took a stand against DDT and were outspoken during the public debates following the publication of Rachel Carson's Silent Spring (1962) and continued to be an activist aside from his scientific research at a time when it was unpopular for scientists to hold political opinions.